Hannover 2010 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

A: Fachverband Atomphysik

A 19: Ultra-Cold Plasmas and Rydberg System

A 19.7: Talk

Thursday, March 11, 2010, 12:15–12:30, B 302

Controlled qubit rotation using Rydberg level shifts — •Ulrich Krohn, Richard Abel, Christopher Carr, and Charles Adams — Atomic and Molecular Physics, Durham University, Durham, United Kingdom

We study the transfer of the population between two ground states in ⁸⁷Rb controlled by an electro-magnetically induced transparency (EIT) resonance. The system used is well described by a four level atom with two ground states coupled by two phase stabilised laser fields 1 to an intermediate state. A Rydberg state is coupled via Ω_r with a detuning δ_r to the intermediate state. With Ω_r = 0 the population is transported from one ground state to the other by means of a π-Raman pulse. This transfer is blocked if Ω_r≠ 0, δ_r=0 as the two photon resonance is lifted by EIT.

The population transfer can be unblocked by shifting the Rydberg level out of laser resonance using an electric field or the interaction of other Rydberg atoms with the dark state of the EIT resonance 2, 4. Given a narrow band excitation laser, e.g. 3, this scheme can be used to implement a single site addressability in an optical lattice when replacing the electric field with an electric field gradient.
References